Back in 2011, we said:

...Without seeing the Hybrid badges or decals, you might not even know that it's so green; for light-duty use, the Sierra Hybrid performs much like a standard version of the GMC Sierra 1500 with one of its two smaller V-8 engines (4.8- or 5.3-liter). But within, the Sierra Hybrid has a powertrain that's out of the ordinary: a two-mode hybrid powertrain, mating an all-aluminum 6.0-liter V-8, with variable valve timing and Active Fuel Management, to an electrically variable transmission (EVT) that packs two electric motor/generators and four fixed-ratio gears. Total... Read More

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